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ID = 4255
United States of America (USA)
Brand: Common type USA tube/semicond.
Developer: Raytheon Mfg. Co.; Cambridge, MA 
Tube type:  Triode-Heptode   Frequency converter   Controlling (mu) 
Identical to 2G22 = CK555AY
Similar Tubes
Normally replaceable-slightly different:
Other base:
First Source (s)
10.Nov.1945 : Electron Tube Registration List rec. 450

Base Subminiatur (wire-ends, flat) B5A
Was used by Radio/TV-reception etc.
Filament Vf 1.25 Volts / If 0.05 Ampere / Direct / Battery =
Description Subminiature frequency converter intended for operation in battery operated sets. Supply voltage from 22.5 to 45 volts.
Similar to 2G21 but leads cut to plug in a socket. 
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
  2G22: G.S.(nach Belmont Boulevard)
Günther Stabe † 19.8.20
2G22: Raytheon 2G22 USA
John Albion

2G22: Mazda Datasheet
Günther Stabe † 19.8.20

More ...
2G22: Manufacturer's Literature
Emilio Ciardiello

from Just Qvigstad

Usage in Models 1= 1945 ; 2= 1948??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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